The convective overshooting are phenomena known for a long time above the tropical continents. They are suspected to be a major source of tropospheric very short lived species, humidification by ice crystals injection, and possibly NOx formed by lightning in the lower stratosphere. However, measurements next and above such cumulo-nimbus clouds are not an easy task. The mini SAOZ is a UV-Visible spectrometer developed in LATMOS since 2009 on more advanced technology. This instrument is making measurements of atmospheric profiles of minor chemical species (O3, H2O, NO2, O4, O2, BrO, OClO,CH2O) by solar occultation. With its new high performance and light-weight payload, the mini-SAOZ is embedded on small balloons for studying the tropical convection. Two flights of qualification have taken place in Kiruna in 2010 and 2011 with the support of CNES. The results of the spectral analysis and the different problems met during the flights have permitted improvements of the instrument to be qualified for the next flights in tropics. Two flights of mini-SAOZ have been operated during the TRO-pico campaign, in 2012, whose objective was to better understand the impact of the tropical convection on the stratospheric chemical composition. The comparisons with other instruments validate the performances of the mini-SAOZ. However, the measurements get through this thesis don't still permit to prove with certainty the mechanisms linked to the tropical convection.
